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Discussion Starter #1
good morning all.
over the weekend i filled up with 95 octane fuel as opposed to the normal momentum 99 or the shell vpower+ and oddly my car has started to perform better.
I did have a remap done on the rolling road when it was running the 95 stuff.
could this be why?
 

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The car is mapped for 95RON as std, so it should perform best on that.

It will only perform better on 99RON if it is mapped for that.
Higher octane Petrol burns slower, so it needs the ignition timing advanced to make use of that. If the timing is still set for 95RON, then it may be worse (as you've found out...).
 

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Edit ...
Forum double posted...:rolleyes:

and then deleted my original post.... I give up!!
 

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:lol: Shall I undelete that for you?
 

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Some cars are mapped for 98RON as std and will run on 95, but only produce their quoted output on 98.
Some of the MiTo are like that, but none of the GTV.
 
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